1. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
2. Oral Health Care Services; Health Centre; Kuopio Finland
3. Department of Oral and Maxillofacial Diseases; Kuopio University Hospital; Kuopio Finland
4. Living Environment and Health Unit; National Institute for Health and Welfare; Kuopio Finland
5. Public Health Evaluation and Projection Unit; National Institute for Health and Welfare; Helsinki Finland
6. Department of Public Health Solutions; National Institute for Health and Welfare; Helsinki Finland
7. Department of Oral and Maxillofacial Surgery; Oulu University Hospital; Oulu Finland
8. Unit of Oral Health Sciences; Medical Research Center Oulu (MRC Oulu); Oulu University Hospital and University of Oulu; Oulu Finland